Re: FYI: default %printer/%destructor

[Joel E. Denny]

On Tue, 21 Nov 2006, Hans Aberg wrote:

> The problem is that EBNF is so fundamental, it is important to find a good
> notation of it.

Bison will already need an alternative for {}.

> > There are only so many characters on the
> > keyboard.
> 
> Well, Unicode has some 100000 plus characters, and one might substitute
> poor-mans-ASCII for some of them.

Do you have a specific proposal in mind?

> > I suspect that using [] in a grammar to mean optional is not nearly as
> > common.
> 
> I think it is quite common, in fact.

I don't mean to say it isn't.  I mean to say that it's less common than 
(), and we have to pick something.